A NEW APPROACH IN DETERMINE OF THE COEFFICIENT OF VARIATION (COV) FOR INTERNAL RAPID MIXING USING A SPACE FILLING CIRCLE GRID FRACTAL FOR

IMPROVING A COMBUSTION BURNING LIMITS

DR BUKHARI MANSHOOR DR HAMIDON SALLEH

DR AMIR KHALID DR ASLAM ABDULLAH

MR HANIS ZAKARIA MR MOHD FAHMI OTHMAN

FUNDAMENTAL RESEARCH GRANT SCHEME VOT 1056

UNIVERSITI TUN HUSSEIN ONN MALAYSIA

ABSTRACT

The applications of the static mixers are widely applied in many industries to obtain the

desired type of mixing. In this context, to perform the mixing process should have two

different fluids that also have different properties which will combines it in a single

equipment to make an another fluid. The main objective of this research study is to

propose a new approach of fractal concept (circle grid perforated plate) for internal rapid

mixing by determining the coefficient of variation (COV). This study was implemented

by fully numerical simulations. The simulations of mixing fluid were carried out with

the help of commercial computational fluid dynamic (CFD) package ANSYS CFX 14.0

sohare. The simulation was done primarily in cylindrical pipe with insertions of circle

grid perforated plate with porosity of 50% and 75%. Three levels of laminar flow have

been chosen to result in Reynolds numbers (Re) equal to 100, 200 and 400. The

effectiveness of circle grid perforated plate static mixer has been evaluated by

comparing the homogeneity level of mixing fluids to the Kenics static mixer that readily

available in industries applications. Based on the research findings, the COV value of

circle grid perforated plate with 75% porosity at Reynolds number 400 is 0.00427 which

is almost completely mixed for mixing fluid and the pressure drop value is 6.02 1Wa. In

term of manufacturing cost and energy loss due to static mixer, definitely this new

approach of 75% porosity circle grid perforated plate is better design compared to the

Kenics static mixer because of lower number of inserts and simpler design of static

mixer to produce.

Table 1 . l(continued): Type of mixing process (Hintz, 2008)

Figure 1.2: Horizontal drum mixer (Agratechniek, 2009)

Figure 1.2 shows one type of the mixer which is horizontal drum mixer that

consist inner blades. The horizontal drum mixer operates as the material flows

1

through the inlet opening into the mixing chamber. The mixing process will be

started when the entire product is loaded and slips over the inner blades. This type of

mixer has no stationary segments which not deal with risk of separation. A11

t components are continuously and randomly picked up and moved through the drum.

After the mixing time the valve opens and mixing chamber will be discharged

automatically. (Agratechniek, 2009)

Pneumatic silo discharging, pneumatic

homogenization, fluidized beds

Vibration systems for charging and

discharging, screen machine, vibration mill

Flow of fluids through granular beds

Vibrations

f t t f l t t

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